JPH0240630Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a magnetic disk cartridge in which a flat magnetic disk is rotatably housed in a hard case. Demand for this type of magnetic disk cartridge is rapidly increasing as a storage device for computers.

Prior Art A floppy disk, which has traditionally been used as a storage device for computers, has a disk-shaped magnetic disk rotatably housed in a flexible jacket mainly made of vinyl chloride, etc. It had a structure in which the head insertion window and the magnetic disk rotation drive window were opened. For this reason,
The jacket may bend during handling and damage the magnetic disk stored inside, or a finger may touch the internal magnetic disk through an opening such as the magnetic head insertion window or rotation drive window, destroying the magnetic recording. There was a danger that the product could be damaged, and great care was required when handling it.

In order to eliminate these drawbacks of floppy disks, a hard case is used instead of a soft jacket, and a flat magnetic disk is rotatably housed within the case, and the magnetic disk is inserted through the opening of the case. A hard type magnetic disk cartridge has been proposed in which the magnetic disk is not exposed to the outside.

FIG. 1 is a perspective view of a hard type magnetic disk cartridge, FIG. 2 is a sectional view showing its internal structure, and FIGS. 3 and 4 are internal views of a case member. In the figure, 1 and 2 are case members that are combined with each other to form a case, and 3 is a disc-shaped magnetic disk that is rotatably housed inside the case members 1 and 2.

The case members 1 and 2 are made of hard plastic, etc., and have greater mechanical strength than conventional jackets and are less susceptible to deformation due to bending. It has a high protective effect against. These case members 1 and 2
has a liner 4 on the inner surface facing the magnetic disk 3.
and 5, respectively, so that a magnetic disk rotation area 6 is formed between the liners 4 and 5.
They are combined with each other from above and below. These case members 1 and 2 are provided with magnetic head insertion windows 7 and 8 in the magnetic disk rotation area 6 (see FIGS. 3 and 4).
8 is opened and closed by a jack 9 attached to the case members 1 and 2 (see FIG. 1).

In addition, outer circumferential ribs 10 and 11 are provided on opposing surfaces of the case members 1 and 2, respectively, and protrude at the same height along their outer peripheries. Ribs 12 and 13 having substantially the same height as the ribs 10 and 11 are arranged in an arc shape. When assembling the case members 1 and 2, as shown in FIG. 5, the end surfaces of the outer circumferential rib 10 and the outer circumferential rib 11, and the ribs 12 and 13 are brought into contact with each other.

Further, a shutter biasing spring insertion portion 14, 15 formed by two ribs 10-12, 11-13 is provided at one corner of the case members 1, 2,
These spring insertion portions 14 and 15 are connected to the outer peripheral ribs 10 and 11.
It communicates with the outside through openings 16 and 17 formed by cutting out a part of the.

Further, a circular opening 18 is formed in the center of the case member 2, and the face plate of the case member 1 facing this opening 18 is in a closed state, and a wear-resistant member 19 or the like is pasted thereon. It has a built-in structure.

Next, the magnetic disk 3 has a structure in which a stepped hub 20 made of a magnetic material is provided at the center, and a donut disc-shaped magnetic recording medium 21 is coaxially connected to the outer peripheral side of the hub 20. A center hole 22 is provided in the center of the hub 20, into which a rotational drive shaft of a recording/reproducing device (not shown) is mounted. The magnetic disk 3 is rotatably mounted between the case members 1 and 2 such that the outer surface of the hub 20 is exposed to the outside through the opening 18 of the case member 2, and the magnetic recording medium 21 is located in the rotation area 6. It will be stored.

To drive the magnetic disk cartridge having the above structure, the rotary drive shaft of the recording/reproducing device is fitted into the center hole 22 of the hub 20, and the tip of the rotary shaft is attached to the inner surface of the case member 1. The rotary drive shaft is brought into contact with the wear-resistant member 19 and rotated in this state. As a result, the magnetic disk 3 is rotated in the rotation area 6 formed in the case member 1 and the case member 2.
Rotationally driven within. Incidentally, at this stage, the shutter 9 (FIG. 1) is open, and the magnetic head is inserted through the insertion windows 7 and 8 to perform magnetic recording/reading.

As mentioned above, in a hard type magnetic disk cartridge, the case members 1 and 2 themselves are hard and have a very high protection function for the internal magnetic disk 3, and the magnetic head insertion windows 7 and 8 and the recording/playback The shutter 9, hub 20, etc. are located in the central opening where the rotating shaft of the device is mounted, so that the magnetic recording medium 3 is not exposed to the outside. Therefore, the protection function for the magnetic disk 3 is higher than in the case of a floppy disk, and handling becomes easier.

Disadvantages of the Prior Art However, in the conventional magnetic disk cartridge, the end surfaces of the rib 12 of the case member 1 and the rib 13 of the case member 2 are flat, and the end faces of the rib 13 of the case member 1 are flat.
As shown in the figure, because the end surfaces of the ribs 12 and 13, which are approximately equal in height, are assembled so as to abut each other, the heights of the ribs 12 and 13 are low;
During assembly, the magnetic recording medium 21 of the magnetic disk 3
There was a problem in that the ribs ran onto the end faces of the ribs 12 or 13 and were sandwiched between the ribs 12 and 13.

As a means to solve this problem, for example, as shown in FIG.
31 and convex portions 122, 132, and one concave portion 121 or 131 may be engaged with the other convex portion 132 or 122.

However, in the case of this interlocking structure, the recess 1
A gap A is generated at the fitting portion between the 21-convex portion 132 and the concave portion 131-convex portion 122. Therefore, in the spring insertion portions 14, 15, the openings 16,
Dirt and dust that enter the spring insertion parts 14 and 15 through the shutter spring 17, or chips generated when the case members 1 and 2 are scraped by the action of the shutter spring, pass through the gap A formed in the fitting part and are magnetized. There was a problem in that the particles entered the disk rotation area 6 and adhered to the surface of the magnetic recording medium 21 of the magnetic disk 3, causing dropouts.

Purpose of the present invention Therefore, the present invention solves the above-mentioned problems and prevents the magnetic disk from being pinched during assembly. At the same time, the present invention prevents dust and dirt from passing through parts that are open to the outside, such as the shutter biasing spring insertion part. An object of the present invention is to provide a magnetic disk cartridge which can prevent dust, chips, etc. from entering a magnetic disk rotation area and has improved assembly and operational reliability.

Structure of the Present Invention In order to achieve the above object, the present invention is constructed by rotatably housing a magnetic disk in a plane in a case constructed by combining a pair of case members. A magnetic disk cartridge is provided with outer circumferential ribs that abut each other and ribs that surround the magnetic disk rotation area on opposing surfaces, and a part of the outer circumferential rib is provided with an opening that opens to the outside, wherein the magnetic disk rotation area The rib surrounding the opening is continuous at the same height as the outer circumferential rib in a portion corresponding to the opening, and is formed so as to partition the magnetic disk rotation area from the opening, and in other portions surrounding the pair of case members. It is characterized by being formed into a stepped shape that interlocks with each other.

Embodiment FIGS. 7 and 8 are plan views of the case member of the magnetic disk cartridge according to the present invention viewed from inside, and FIGS. 9 and 10 are enlarged sectional views of the main parts. In the figures, the same reference numerals as in FIGS. 1 to 6 indicate the same components. The feature that is different from the conventional one is that the ribs 12 and 13 surrounding the magnetic disk rotation area 6 are continuous at the same height in the portion corresponding to the opening communicating with the outside, and the magnetic disk rotation area 6 is separated from the opening. In other parts, the case member 1-
The two parts are formed into a stepped shape that engages with each other. In this embodiment, the ribs 12, 13 are connected to a spring insert 1 having openings 16, 17 communicating with the outside.
As shown in the enlarged view in FIG.
It is formed so as to be divided into sections 6 and 17. On the other hand, in other parts, as shown in FIG.
and a convex portion 12 higher than the stepped portions 121 and 131.
It is formed in a stepped shape having a diameter of 2,132.

The ribs 12, 13 are not provided in the portions facing the convex portions 122, 132, and the case member 1,
The inner bottom surfaces of 2 are facing each other. The height h ₁ of the convex portions 122, 132 of the case members 1, 2 is the same as that of the case members 1, 2.
It is approximately equal to the inner bottom surface spacing of No. 2.

Since the magnetic disk cartridge according to the present invention has the above-described structure, the case members 1 and 2
In this case, the end surfaces of the stepped portion 121 of the case member 1 and the stepped portion 131 of the case member 2 are in contact with each other, and the convex portion 122,
The case members 1 and 2 are assembled so that the end surfaces thereof are in contact with the inner bottom surfaces of the case members 1 and 2. In this case, the ribs 12 and 13 forming the magnetic disk rotation area 6 are
22, 132 is high, so this convex part 1
22 and 132 prevent the magnetic disk 3 from riding on the end surface of the rib 12 or 13 during assembly, and prevent the magnetic disk 3 from riding on the end surface of the rib 12 or 13.
13 is prevented from being caught between the two. Stepped portion 121,1
31 and the convex and concave fitting portions of the convex portions 122 and 132, a small gap is generated, but since the outer peripheral ribs 10 and 11 are closed on the outside thereof, dirt, dust, etc. do not enter.

Moreover, in the parts having openings 16, 17 that communicate with the outside, such as the spring insertion parts 14, 15, the ribs 12, 13 are continuous at the same height as the outer peripheral ribs 10, 11, and the magnetic disk rotation area 6 are separated from the spring insertion parts 14, 15 and the openings 16, 17, so dirt and dust that enters the spring insertion parts 14, 15 through the openings 16, 17, or by the action of the shutter spring, can damage the case members 1, 2. Chips generated by the scraping of the magnetic disk do not enter into the magnetic disk rotation area 6. This prevents dropouts due to adhesion of dirt, dust, or chips, and improves reliability.

The more places the ribs 12 and 13 have unevenness, the better. In particular, it is desirable that the ribs 12 and 13 at the other three corners, excluding the corner where the spring insertion parts 14 and 15 are located, are all formed in an uneven shape. However, when assembling the magnetic disk 3 by inserting it into the case member 1 or 2, if the case member 1 or 2 is tilted,
As long as the magnetic disk 3 is brought into contact with any one of the uneven portions, the number of the uneven portions may be 1 to 3.

Effects of the present invention As described above, the present invention is constructed by rotatably housing a flat magnetic disk in a case constructed by combining a pair of case members. A magnetic disk cartridge is provided with an outer peripheral rib that contacts each other and a rib that surrounds the magnetic disk rotation area on facing surfaces, and a part of the outer peripheral rib is provided with an opening that opens to the outside, wherein the magnetic disk rotation area is The surrounding ribs are continuous at the same height in a portion corresponding to the opening so as to separate the magnetic disk rotation area from the opening, and in other portions are formed with steps that engage with each other between the pair of case members. Because it is shaped like a bell, it prevents the magnetic disk from being caught during assembly, and at the same time prevents dirt, dust, or chips from passing through parts that are open to the outside, such as the shutter biasing spring insertion part. Therefore, it is possible to provide a magnetic disk cartridge that can prevent foreign particles from entering the magnetic disk rotation area, and has improved assembly and operational reliability.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of the magnetic disk cartridge, Fig. 2 is an enlarged sectional view of the main part to show its internal structure, Figs. 3 and 4 are plan views of the inner surface of the case member, and Fig. 5 6 is an enlarged sectional view of a part of a conventional magnetic disk cartridge, FIG. 6 is an enlarged sectional view of a part of another conventional example, and FIGS. 7 and 8 are cases of a magnetic disk cartridge according to the present invention. FIG. 9 is a plan view of the member viewed from the inside, FIG. 9 is an enlarged sectional view of a portion thereof, and FIG. 10 is an enlarged sectional view of the spring insertion portion. 1, 2...Case member, 3...Magnetic disk,
10, 11... outer peripheral rib, 12, 13... rib,
14, 15... Spring insertion portion, 16, 17... Opening.

Claims (1)

[Claims for Utility Model Registration] (1) A planar magnetic disk is rotatably housed in a case constructed by combining a pair of case members, and the facing surfaces of the pair of case members are In a magnetic disk cartridge, a magnetic disk cartridge is provided with an outer circumferential rib that abuts each other and a rib that surrounds the magnetic disk rotation area on the top, and a part of the outer circumferential rib is provided with an opening that opens to the outside, and the rib that surrounds the magnetic disk rotation area. teeth,
A portion corresponding to the opening is continuous with the outer circumferential rib at the same height and is formed so as to partition a magnetic disk rotation area from the opening, and another portion is stepped to engage with each other between the pair of case members. A magnetic disk cartridge characterized by being formed into a shape. (2) A magnetic head insertion window is provided in the magnetic disk rotation area of the pair of case members, a shutter for opening and closing the magnetic head insertion window is attached to the case, and a shutter is provided in the case at least one corner of the pair of case members. , a shutter biasing spring insertion portion formed by the two ribs is provided, and the spring insertion portion is communicated with the outside through an opening formed by cutting out a part of the outer circumferential rib, and A registered utility model characterized in that the surrounding rib is continuous at the same height as the outer circumferential rib at a portion corresponding to the spring insertion portion, and is formed so as to partition a magnetic disk rotation area from the spring insertion portion. A magnetic disk cartridge according to claim 1.